Magnetization current density and irreversibility line of Tl2Ba2CaCu2O8 superconducting film

The magnetization loops M(T, H-a) and the irreversibility line H-irr(T) of a epitaxial Tl2Ba2CaCu2O8 superconducting film have been measured. When the self-field effects of the. current (B) over right arrow' (r) are considered, the field and temperature dependence of the magnetization current density J(T, B) is obtained in a self-consistent way using finite-element analysis, where (B) over right arrow(r) = mu(0) (H) over right arrow(a)+(B) over right arrow'(r).